Self-hosted auto-updates from Gitea via PUC + proprietary licence

Vendors YahnisElsts/plugin-update-checker v5.7 under vendor/ and wires
it to poll updates.json on the repo main branch. WP surfaces new
versions via Dashboard → Updates on its normal twice-daily cadence.

PUC is vendored (not a submodule) so Gitea's archive/main.zip — the
download target — includes it.

Also relicenses from GPL-2.0-or-later to a proprietary licence granting
use only to authorised sites, with all other rights reserved. Plugin
URI + Author URI switched from the placeholder github.com URL to the
canonical Gitea repo.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

vendor/plugin-update-checker/languages/plugin-update-checker-de_DE.po

@@ -0,0 +1,38 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: plugin-update-checker\n"
+"POT-Creation-Date: 2016-06-29 20:21+0100\n"
+"PO-Revision-Date: 2016-06-29 20:23+0100\n"
+"Last-Translator: Igor Lückel <info@igorlueckel.de>\n"
+"Language-Team: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: Poedit 1.8.1\n"
+"X-Poedit-Basepath: ..\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"X-Poedit-SourceCharset: UTF-8\n"
+"X-Poedit-KeywordsList: __;_e\n"
+"Language: de_DE\n"
+"X-Poedit-SearchPath-0: .\n"
+
+#: github-checker.php:137
+msgid "There is no changelog available."
+msgstr "Es ist keine Liste von Programmänderungen verfügbar."
+
+#: plugin-update-checker.php:852
+msgid "Check for updates"
+msgstr "Nach Update suchen"
+
+#: plugin-update-checker.php:896
+msgid "This plugin is up to date."
+msgstr "Das Plugin ist aktuell."
+
+#: plugin-update-checker.php:898
+msgid "A new version of this plugin is available."
+msgstr "Es ist eine neue Version für das Plugin verfügbar."
+
+#: plugin-update-checker.php:900
+#, php-format
+msgid "Unknown update checker status \"%s\""
+msgstr "Unbekannter Update Status \"%s\""